high-strain-rate response of ultra-fine-grained copper

Effects of microstructure on mechanical properties of CuNiSi

fine grained or even a UFG structure followed by precipitation treatment results in the combination of optimized properties and optimized grain and subgrain structure, which seems to be a promising method to generate the high-performance components [14,22]. If

EXPERIMENTAL ANALYSIS OF MICROSTRUCTURE AND MECHANICAL PROPERTIES OF COPPER

Experimental analysis of microstructure and mechanical properties of copper and brass based alloys 2318 thermal conductivity with high corrosion resistance. E-Cu is oxygen-free copper which has more applications where high magnetic fields are utilized and also

Effects of lattice misorientations on strain heterogeneities in FCC polycrystals

Journal of the Mechanics and Physics of Solids 54 (2006) 671–689 Effects of lattice misorientations on strain heterogeneities in FCC polycrystals Ke-Shen Cheonga,, Esteban P. Bussob aMPT Solutions, Industrial Research Ltd., Lower Hutt, New Zealand bDepartment of Mechanical Engineering, Imperial College London, UK

Nanocrystalline materials and coatings

Nanocrystalline materials and coatings S.C. Tjong*, Haydn Chen Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Available online 10 August 2004 Abstract In recent years, near-nano (submicron

Ultimate tensile strength

Ultimate tensile strength (UTS), often shortened to tensile strength (TS), ultimate strength, or within equations, is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials the ultimate tensile strength is close to the yield point, whereas in ductile materials the ultimate tensile strength can be higher.

Thermally induced oxidative growth of copper oxide nanowire on dendritic micropowder and reductive conversion to copper

Thermally induced oxidative growth of copper oxide nanowire on dendritic micropowder and reductive conversion to copper nanowire Amir Mirza Gheitaghy1,2, Seyyede Shahrzad Tabatabaei1, Hamid Saffari1, Guo Qi Zhang2 1School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16844, Iran

Ultra

We report ultra-large room-temperature plasticity of nanocrystalline Ni subjected to uniaxial compression. Up to 200% true plastic strain is achieved with a steady flow stress of ∼2 GPa at strain rates ranging from 10-3 to 10-1 s-1. The low temperature, high strain rate, and high flow stress demonstrate that the observed ultra-large plasticity in nanocrystalline Ni is intrinsically

Determination of the strain

In the case of ultrafine-grained Al and ultrafine-grained Cu good agreement between this technique and macroscopic compression tests has been achieved. In contrast to this, individual spherical nanoindentation experiments at constant strain-rates resulted in unrealistically high strain-rate sensitivities for both materials because of drift influences.

Amorphization in extreme deformation of the CrMnFeCoNi

Figure 1C shows the equivalent stress versus equivalent strain response at a slow strain rate of 10 −3 s −1 and strain rates higher by over several orders of magnitude (1.7 10 3 to 6 10 5 s −1).We have expressed the stresses and strains here as equivalent

Effects of lattice misorientations on strain heterogeneities in FCC polycrystals

Journal of the Mechanics and Physics of Solids 54 (2006) 671–689 Effects of lattice misorientations on strain heterogeneities in FCC polycrystals Ke-Shen Cheonga,, Esteban P. Bussob aMPT Solutions, Industrial Research Ltd., Lower Hutt, New Zealand bDepartment of Mechanical Engineering, Imperial College London, UK

EXPERIMENTAL ANALYSIS OF MICROSTRUCTURE AND MECHANICAL PROPERTIES OF COPPER

Experimental analysis of microstructure and mechanical properties of copper and brass based alloys 2318 thermal conductivity with high corrosion resistance. E-Cu is oxygen-free copper which has more applications where high magnetic fields are utilized and also

High

2007/6/1Equal Channel Angular Pressing (ECAP) is a severe plastic deformation technique that was used to produce ultra-fine grained copper. The microstructure was optimized using different deformation sequences. A steady state grain size of 200-500 nm was routinely obtained after eight passes (with an effective strain of ̃1 per pass). This resulted in a random texture evidenced by EBSD results. The

Mechanical properties and deformation mechanisms of nanocrystalline Fe

response of nanocrystalline copper produced from ball-milled powder, with grains ranging from 22 to 720 nm. They observed that the yield stress and the strain rate sen-sitivity increased, while the strain hardening rate decreased, with diminishing grain size

The shock and spall response of three industrially

Greeff [] established a high strain-rate phase diagram and Hugoniot equation of state which clearly illustrated the transition through these three phases. In particular, under shock loading conditions, zirconium has been observed to undergo an α – ω phase transformation across a range of pressures from 2.3 to 8.5 GPa.

Using Instrumented Indentation to Measure Strain

Figure 2. Modulus during strain-rate cycling for one typical test. As expected, modulus is not sensitive to strain rate. The modulus value reported for each test in Table 2 is the average of the three cycle-level results for that test. The average over all tests, 229GPa, is

Amorphization in extreme deformation of the CrMnFeCoNi

Figure 1C shows the equivalent stress versus equivalent strain response at a slow strain rate of 10 −3 s −1 and strain rates higher by over several orders of magnitude (1.7 10 3 to 6 10 5 s −1).We have expressed the stresses and strains here as equivalent

Very high cycle fatigue of copper: Evolution, morphology and

Very high cycle fatigue of copper: Evolution, morphology and locations of surface slip markings N.L. Phung aa, V. Favier a,, N. Ranc, F. Vals a, H. Mughrabi b a Arts et Mtiers ParisTech, PIMM UMR CNRS 8006, 151 Bd de l'Hpital, 75013 Paris, Franceb Department ofMaterials Science Engineering, University Erlangen-Nrnberg, Martensstr. 5, 91058 Erlangen, Germany

Micromechanical analysis of strain rate

They have also investigated influence factors in ultra-fine grained and nanocrystal-line Cu and Al, including the effects of grain size, strain rate, and temperature (Farrokh and Khan, 2009). Phenomenological 0749-6419/$ - see front matter 2011 Elsevier Ltd.

Microstructural evolution in ultra

Equal Channel Angular Pressing (ECAP) is a severe plastic deformation technique that was used to produce ultra-fine grained copper. The microstructure was optimized using different deformation sequences. A steady state grain size of 200--500 nm was routinely obtained after eight passes (with an effective strain of ̃1 per pass). This resulted in a random texture evidenced by EBSD results. The

Effect of Strain Rate on Tensile Ductility and Fracture

A bulk columnar‐grained copper with preferentially oriented nanoscale growth twins is prepared by means of direct‐current electrodeposition. Tensile tests at different strain rates reveal a significant influence of strain rate on the tensile ductility and fracture behavior. The ductility, especially the post‐necking elongation, reduces dramatically at low strain rates, which is

Femtosecond quantification of void evolution during rapid

Understanding high-velocity impact, and the subsequent high strain rate material deformation and potential catastrophic failure, is of critical importance across a range of scientific and engineering disciplines that include astrophysics, materials science, and aerospace engineering. The deformation and failure mechanisms are not thoroughly understood, given the challenges of experimentally

Femtosecond quantification of void evolution during rapid

Understanding high-velocity impact, and the subsequent high strain rate material deformation and potential catastrophic failure, is of critical importance across a range of scientific and engineering disciplines that include astrophysics, materials science, and aerospace engineering. The deformation and failure mechanisms are not thoroughly understood, given the challenges of experimentally

Correlating damage progression to fragmentation at high

2020/1/23where is the fracture resistance of the material.Grady's model [] predicts a −2/3 power law dependence of the fragment size on the strain rate.By including the effects of elastic strain energy, Glenn et al's model [16, 17] predicts a transition to a rate independent region at lower strain rates, while converging to Grady's model at high strain rates.

Controlling gradation of surface strains and nanostructuring by large

Figure 1 a and b show the shear strain rate determined using PIV for copper (+20 ) and brass ( 30 ), respec-tively. The region of high strain rate characterizes the deformation zone in these figures. A narrow region of severe deformation with strain rate of about

Nanometer to Micron Scale Atomistic Mechanics of Silicon

The strain-rate sensitivity index value is 0.112 at 67.49-nm average grain size, 0.104 at 90-nm average grain size, and 0.077 at 135-nm average grain size. Koskinen et al. ( 1993 ) did not report the experimental strain rate in their data.

Effect of Severe Plastic Deformation in Machining

Here, we propose a generalizable rate-strain-microstructure (RSM) framework for relating the deformation parameters to the resulting deformed grain size and interface characteristics. We utilize Oxley's model to calculate the strain and strain-rate for a given orthogonal machining condition which was also validated using digital imaging correlation-based deformation field characterization.

Effect of Severe Plastic Deformation in Machining

Here, we propose a generalizable rate-strain-microstructure (RSM) framework for relating the deformation parameters to the resulting deformed grain size and interface characteristics. We utilize Oxley's model to calculate the strain and strain-rate for a given orthogonal machining condition which was also validated using digital imaging correlation-based deformation field characterization.

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